Automatic notification of update changes

1. +++ b/modules/entity_share_notifier/src/Form/EntityShareSubscriberForm.php
   @@ -0,0 +1,153 @@
   +    $form['basic_auth'] = [
   

   If this is an auth method like in the remote config entity, this shouls use the same mecanism now that authentication is pluggable.

2. +++ b/modules/entity_share_notifier/src/HookHandler/EntityHookHandler.php
   @@ -0,0 +1,228 @@
   +      ->getStorage('channel')
   

   Filter the channels based on the langcode, entity type and bundle before loading the channels if possible to avoid loading hundreds of entities depending on the websites.

3. +++ b/modules/entity_share_notifier/src/HookHandler/EntityHookHandler.php
   @@ -0,0 +1,228 @@
   +      // TODO. Will require to add a new field on channel to store the user to
   

   Or this will require to have an array of channel_id, user_id in the subscriber config entity instead of an array of channel IDS.

4. +++ b/modules/entity_share_notifier/src/HookHandler/EntityHookHandler.php
   @@ -0,0 +1,228 @@
   +      ->loadMultiple();
   

   Possible to add a condition on the channels based on $channels_to_notify? To avoid loading unnecessary entities.

5. +++ b/modules/entity_share_notifier/src/HookHandler/EntityHookHandler.php
   @@ -0,0 +1,228 @@
   +      $http_client = $this->clientFactory->fromOptions([
   

   Should we require that a subscriber should reference a remote to benefit from the authentication system? And so we can use the remote manager service to get the HTTP client.

I wrote some code a long while ago for the channel filtering. This goes before $channels_to_notify[] = $channel->id();:

      $filters = $channel->get('channel_filters');

      $passedFilters = true;
      foreach ($filters as $filter) {
        $directField = $filter['path'];
        if ($entity->hasField($directField)) {

          // Only checks first value right now.
          $firstValueFromFilter = trim((string)$filter['value'][0]);

          if ($filter['operator'] === '=') {
            $fieldValue = trim($entity->get($directField)->getString());

            if ($fieldValue !== $firstValueFromFilter) {
              $passedFilters = false;
            }
          } elseif ($filter['operator'] === 'CONTAINS') {
            if (!Arrays::any($entity->get($directField)->getValue(), function (
              $element
            ) use ($firstValueFromFilter) {
              if (isset($element['value'])) {
                $fieldValue = $element['value'];
              }

              return $fieldValue === $firstValueFromFilter;
            })) {
              $passedFilters = false;
            }
          }
        }
      }

      if (!$passedFilters) {
        continue;
      }

For number 5, we could load it from the remote_id:

      $remote_id = $subscriber->get('remote_id');
      $remote_config_id = $subscriber->get('remote_config_id');
      $remote = $this->entityTypeManager->getStorage('remote')->load($remote_id);

      if (!($remote instanceof RemoteInterface)) {
          throw new \LogicException("Could not load remote with ID $remote_id");
      }

      $http_client = $remote->getHttpClient(true);

This could also be done in the constructor if you feel that's cleaner.